Telephone system



@ein l J. C. STILES TELEPHONE SYSTEM Filed April 28. 192x Imran/n.'

@ima

Patented Oct '21, 1924.

unire stares Parent orifice..

Jorin c. s'rILi'is, or s'r. Louis,ivrIsso-Rr.v

TELEPHONE SYSTEM.

Application meaapril 2s, 1921. serian No. 4a5206.

Be iftknown'that l, J oHN C.v SriLns, a'citizenlo'fvthe United States, residing at the city orp St. Louis, in the State of Missouri, have invented certain' new ments in vTelephone Systems, of which 'the following is a specification.

My invention has relation to improvements in telephone circuits and consists in thenovel features'of construction more fully set forth in the specification and pointed out in the claim.

The object of the present invention is to provide a system of telephone circuits that may be applied to party lines, whereby one party on the line may speak to an outside party without being in circuit with another party on his line, so that parties cannot listen in on each other. A further object is to provide a telephone system wherein parties on the same line may speak to each other to the exclusion of other parties on the line.

Further and other advantages will be better apparent from a detailed description of the invention in connection with the accompanying drawing, which is a diagrammatic view o my improved telephone circuit showing the connections and arrangements of switches whereby I accomplish the desired result.

Referring to the drawing, 1 represents a battery supplying energy to the line wires 2 and 3, and 4 represents a reversing switch connected across said wires. A polarized relay 5 operates to cut out of circuit the phones 6, 7, 8, 9, except the one that is being used.

The phones 6, 7, 8 and 9 are in series with coils 10, 11, 12, 13, respectively, said coils however, being connected in multiple and all of them being in series with the armature 14 of the relay 5. Armature 14 is connected to line 3 by the conductor 15.

The invention can best be understood by tracing the respective circuits. lVhen none of the phones are in use, of course, all the phone circuits are open; but as soon as the receiver of any phone is picked up the circuit of that phone is immediately closed as well understood in the art.

Connected in series with line wire 2 is the coil 16 of the relay 5, said coil also being in series with conductor 17. Conductor 17 it and useful 'Improve-k will beobserved is inseries with all of the telephone circuits, the' connected in multiple as follows: v

y*Coils 10,11", 12 and 13 4are connected to conductor 17fby conductors 18, 19, 20 fand'2-1 and to fthe yphones 6, 7, 8, 9, by'condu'ctors 22, 23,24, 25, which terminate at contacts 26,27, Conductors30, 31, 32, 33 have"connection with the hook 34, 35, 36, 37 whence they go to the armature 14 of the relay 5, and contact with said armature when it is in either neutral position or attracted by pole B of the rela The conductors 30, 31, 32, 33 are connected to line wire 3 by conductors 38, 39, 40, 41, switches 42, 43, 44, 45, and conductors 46, 47, 48, 49.

The operation of my invention will now be described. Assume a party desires to use phone 6. l/Vhen the receiver is taken oii the hook the phone circuit is closed as follows:

Line wire 2, coil 16, conductor 17, conductor 18, coil 10, conductor 22, contact 26, hook 34, conductor 30, armature 14, conductor 15, line wire 3i. The closing of this circuit energizes coils 16 and 10, causing pole A to attra-ct armature 16 opening the phone circuits at this point, and closing the circuit of phone 6 through the attraction of armature 42 to conductor 38 Vwhence the circuit is completed thru. 46 and 15. However, none of the other phones will be on closed circuit because their armatures (43, 44 :and 45) could not be attracted since their respective receivers are on the hooks and the circuit open. Should any one of the other parties lift his receiver oii' while phone 6 is enga-ged he will not be able to listen in because his circuit is open at armature 14 (the same still being attracted to the left). As soon as phone 6 has its receiver replaced on the hook 34 the circuit will again be open and armature 14 restored to neutral position in contact with conductors 30, 31, 32, 33. Ther-above described operation takes place irrespective of which phone is used. It is thus seen that I have provided an electrically controlled switch (armature 14) for opening all the phone circuits when one is in use, `and simultaneously closing at another point the circuit of the phone that is being used.

Suppose one party wishes to speak to an- 1 phone Vcircuitsjbein'l'g 28, 29, (in the phone) respectively.

of armature 45 to conductor 41).`

other party'on the seme line, for example, phone 6 with phone 9. In this instance the operato-r reverses theroirouit in the coil 16 by mean-s of the reversing Switch r4 causing the armature 14 to be attracted to pole B Where it remains in Contact With conductors 30, 31, 32, 38. Phone 9 is then signalled and on taking upi the receiverV its circuit is closed in the same manner that that lof phone 6 Was closed (through the attraction 6 and 9 are no-W both in circuit With line Wires 2, 3, andthe operator again reverses the switch 4 causing armature 14 to be attracted to pole A and opening the circuits of phonesl 7 Aand 8 at this point so that they cannot get into oireuit'with 6 and 9.V

From the foregoing it is apparent that the'relay 5 may be VControlled to permit parties on the saine line to be connected without other parties on the line listening in.

Phones Y ized relay including a eoil connected in series with oneof the said line Wires and in# oluding also an armature, e oonneoting oonductor between the said armature and the other one of the said line wires, a plurality of phone circuits including coils and phones connected in series with the saidooils, the said coils of the phone circuits being conneoted in multiple and all of them being in series With thesaid armature of the polarized relay, and e Conductor in series with the said Coil of the relay and in series also with `all of the, said phone circuits.

1n testimony whereof I hereunto aix my signature.

JOHN o. srrLns. 

